Stone dressing or polishing tool.



No.,7|6*, |7l. 1 Patented Dec. I6, |902.

' E. C. BASSETT.

STONE DRESSING `(JR POLISHING TOOL.

(Application med May 1o, 1901.)

(No Model.)

i WTNBSBES:

ma nomas Perses. camcom-umn, WASHINGTON( .y c

` which I will nowv proceed to describe and `bedded in the plate a, whiletheir lower ends UNITED .Armar Prion.

ELMER O. BASSETT, OF MILTON, MASSACHUSETTS, ASSIGNOR TO P. T.

MAGUIRE, OF MILTON, MASSACHUSETTS.

\ fSTQNE DRESSING OR POLISHINGTOL.`

SPECIFICATION formingpart of Letters Patent No. 716,171, dated December 16, 1902.

application nea nay 1o, 1901.

T @ZZ wil/om t may concern:

Be itknown that I, ELMER O. BAssnTT, of Milton, in the county of Norfolk and'State of Massachusetts, have invented certain new and useful Improvements in Stone Dressing or Polishing Tools, of which the following is a Specification. i i

This invention relates to tools or appliances for dressing or polishing granite blocks to perform the rstpart of the operation of imparting a high polish thereto.

The invention consists in the improvements claim. y

Of the accompanying drawings, Figure l representsabottom plan view of a stone dressing or polishing appliance embodying my invention. Fig. `2 represents a section on line 2 2 of Fig. l. Fig. 3 representsa view similar to Fig. 1, showing a modification.

The same letters of reference indicate the same parts in all thefigures.

In the drawings, ct represents ahead or plate, which is'preferably a flat-sided Adisk having a marginal flange h projecting down` wardly from its under side.` 4 i A c c represent wrought-metal Scrapers attached to the platea and projecting there# through into the space surrounded by theA flange b. Said Scrapers are preferably of wrought-iron and in the embodiment of my invention shown in Figs. lA and 2 are'iof tubular form, their upper ends being emare ush with the lower edge of the ange b and constitute the cutting portions of the Scrapers. Thespaces between the Scrapers are filled with" a Iilling material or composition d, adapted to laterally support the scrapers and prevent them fromfbeing exed or sprung, said lling being of such naturethat it wears away somewhat fasterthan the material ofthe Scrapers and preferably of a fri` able material, suchas plaster-of-paris. The

central portion of the plate a is provided with an orifice a to permit the passage of powdered polishing material from the plate to the surface acted on by the Scrapers, the Scrapers stanno. 59,679. (No man.)

`being arranged in a series surrounding the orice a', and the lling d being made in annular form, so that its inner wall constitutes an extension of the orifice a.

The tubular form of the Scrapers gives each scraper a cross-section so formed that its acting end has elongated scraping edges sepa rated by a relatively narrow body portion, so that the acting end of each scraper has scraping edges which are arranged to operate very effectively upon the stone, said edges extending in various directions, so that when the device is rotated in contact with the stone surface to be dressed portions of said edges act with a shearingcut, which is very desirable in polishing or dressing stone, and particnlarly granite.

The openin gs through the tubular Scrapers are preferablyextended through the plate a, so that polishing material placed upon the upper side of the plate is fed through the tubular Scrapers and is thus eectively distributed and presented at the points where it is required. The plate a is provided with a marginal upwardly-projecting curb or Wall e to confine the polishing material and prevent it from beingthrown outwardly by centrifugal force when the appliance is being rotated.

The head a is provided with suitable meinbersfffor engagement with a tleXible jointed shaft, (not shown,) which imparts rotary motion to the head, the flexibility of the shaft permitting the appliance to be moved about uponthe surface of the Stone while it is being rotated.` j

LI prefer to make the head a and its iiange h of cast-iron and to cast said head around the upper ends of the Scrapers c, the head and Scrapers being thus firmly united.

In Fig. 3 I show a modification in which the Scrapers c instead of beingtubular are composed of wrought-metal strips c', which are approximately flat or slightly curved in crosssection, the thickness of the metal or body of the strip between the side faces thereof` being preferablyabout the same as the thickness of thewall of each tubular scraper c. The Scrapers c' are preferably arranged obliquely, as shown in Fig. 3, so that each gives a shearing cut when the appliance is rotated. The Scrapers c' may be Secured to the head a by casting the material of the head around the upper ends of said Scrapers.

It will be observed that in each form shown the Scrapers arecurved in cross-Section and that they are arranged in irregular order, so that no individual Scraper directly follows the one preceding it. In other Words, they break joints, and therefore provide a large number of individual or relatively `Small Scrapers which Will properly follow over and cut into the Surface of the Stone to be dressed A -surrounded by said flange, and a friable filling surrounding said tubular Scrapers, the openings of the tubular Scrapers extending through the head or plate so that they may conduct polishing material to the acting ends of the Scrapers.

3. An appliance of the character specified comprising a head or plate having a marginal flange projecting from one of its sides, a seriesl of tubular Wrought-metal Scrapers attached to the plate and projecting into the space Surrounded by Said flange, and a friable filling Surrounding said tubular Scrapers, the head or plate and the friable lling having a central orifice for the admission of polishing material to the Surface acted on by the scrapers, said orifice being surrounded by the Series of Scrapers.

4. An appliance of the character described comprising a head or plate having a marginal lian ge projecting from one of its Sides, a Series of tubular Wrought-metal Scrapers attached to the plate and projecting into the Space surrounded by Said flange, and a friable filling Surrounding Said tubular Scrapers, the openings of the tubular Scrapers extendingthrough the head or plate so `that they may conduct polishing material to the acting ends of the Scrapers, the head or plate having an upwardly-projecting marginal curb to confine the polishing material.

In testimony whereof I have affixed my Sig-` nature in presence of two Witnesses.

ELMER C. BASSETT. Witnesses:

C. F. BROWN, C. C. STECHER. 

